ZyXEL Communications 642R Series manual Executing an IP Filter

Prestige 642R Series ADSL Router

Packet

into IP Filter

Filter Active?	No
Yes
Apply SrcAddrMask
to Src Addr
Check Src	Not Matched
IP Addr
Matched
Apply DestAddrMask
to Dest Addr
Check Dest	Not Matched
IP Addr
Matched
Check	Not Matched
IP Protocol
Matched
Check Src &	Not Matched
Dest Port
Matched
More?	Yes
No		Action Not Matched
Action Matched	Check Next Rule
	Check Next Rule	Drop	Forward
Drop	Forward
Drop Packet	Check Next Rule		Accept Packet

Figure 8-10 Executing an IP Filter

8-12 Filter Configuration